Floating division miscalculation with launching in landscape mode

Floating division miscalculation with launching in landscape mode

[Title] Floating division miscalculation with launching in landscape mode
[Issue#] N_SE-35034, N_SE-35003
[Problem] Content is not fitted correctly if browser loads media content in
        landscape mode
[Cause] Minimum scale factor is selected maximum one between horizontal and
        vertical minimum scale factor. And on landscape mode, vertical minimum
        scale factor is a bit larger than horizontal minimum scale factor. So,
        content is not fitted initially.
[Solution] Ignore a bit difference between horizontal and vertial minimum
        scale factor. And initialize m_viewportAngle for landscape mode
        launching.

Change-Id: I9c551f35606ea724cceaa2461a39705bfd8f949b